31231302133231 has 4 divisors (see below), whose sum is σ = 31232400579072. Its totient is φ = 31230203687392.

The previous prime is 31231302133193. The next prime is 31231302133237. The reversal of 31231302133231 is 13233120313213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31231302133231 - 2¹⁹ = 31231301608943 is a prime.

It is a super-2 number, since 2×31231302133231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31231302133231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231302133237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549180271 + ... + 549237136.

It is an arithmetic number, because the mean of its divisors is an integer number (7808100144768).

Almost surely, 2^{31231302133231} is an apocalyptic number.

31231302133231 is a deficient number, since it is larger than the sum of its proper divisors (1098445841).

31231302133231 is a wasteful number, since it uses less digits than its factorization.

31231302133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098445840.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 31231302133231 its reverse (13233120313213), we get a palindrome (44464422446444).

The spelling of 31231302133231 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred two million, one hundred thirty-three thousand, two hundred thirty-one".